Section Member And System Level Analyses For Precast Concrete Hybrid Frames

Utilizing component and system level performance verification tests, the precast hybrid frame concept has been developed for seismic applications over the past decade. During the course of this development, guidelines for designing hybrid frame connections have been proposed. The main objective of this study is to examine validation of the three different guidelines proposed recently for the design of hybrid frame systems using existing data from two component and one system level tests. The validation procedure involves establishing analysis methods based on the proposed design steps and assumptions, and comparing the analysis results with the experimental data. Since experimental data were not available for all key design parameters, the analysis results are also compared with those obtained from the analysis based on the monolithic beam analogy concept. Using the comparison of results obtained from different means, validation for the design guidelines and appropriate recommendations to improve the design of precast concrete hybrid frame connections are provided.

Hybrid Composite Precast Systems: Numerical Investigation to Construction focuses on the design and construction of novel composite precast frame systems that permit almost effortless erection and structural efficiency. The precast frame systems discussed in the book are similar to that of steel frames, but offer similar savings to concrete frames. The design of connections and detailed analysis of their structural behavior is discussed in detail. Fundamentals with regards to the post yield behavior of concrete and metal are also presented to illustrate how these two different materials are integrated together to remove individual material drawbacks. Readers are given a broad introduction to existing technologies that are then combined with a description of the construction methods the author proposes. This book will help the end users become familiar with the existing types of structural forms, not just the "Lego" type frame system that the author proposes. Discusses how traditional construction methods can be replaced by innovative hybrid composite precast frame systems that provide rapid and effortless erection capabilities and structural efficiency Contains several design examples using non-linear finite element analysis completed with Abaqus based-software Contains new milestone inventions in construction that offer structural engineering solutions using a novel, modularized hybrid frame system Provides information on structural testing that verifies the accuracy of the structural design

Experimental studies have shown that precast hybrid frames with dry jointed connections can provide adequate performance in high seismic zones. This framing concept, which has been accepted by the International Conference of Building Officials (ICBO), utilizes unbonded post-tensioning and mild steel reinforcement debonded over a short distance to establish a moment resisting connection between precast beams and columns. As a result, the hybrid frame systems have the ability to sustain minimal residual displacements while dissipating more energy when subjected to seismic lateral forces. However, this connection concept introduces strain incompatibility between concrete and steel making the analysis and design methods very complex. Consequently, the available analysis and design methods are based on many simplified assumptions. In this analytical investigation, an improved set of expressions using the monolithic beam analogy was established for connection level analysis, which accurately account for the material behavior, strain penetration effects, strain hardening in the tension reinforcement, and compression force contribution of the mild steel reinforcement. The accuracy of the improved expressions was demonstrated at the section and system levels using experimental data. The improved analysis procedure was then used to examine the response of a five-story precast hybrid building model under different earthquake loading. From the response of the building, it has been shown that the hybrid building will perform satisfactorily under earthquakes of different intensities. An investigation on a suitable response modification reduction (R) factor for design hybrid building is also presented.

The aim of this state-of-art report is to present current practices for use of precast and prestressed concrete in countries in seismic regions, to recommend good practice, and to discuss current developments. The report has been drafted by 30 contributors from nine different countries. This state-of-art report covers: state of the practice in various countries; advantages and disadvantages of incorporating precast reinforced and prestressed concrete in construction; lessons learned from previous earthquakes; construction concepts; design approaches; primary lateral load resisting systems (precast and prestressed concrete frame systems and structural walls including dual systems) diaphragms of precast and prestressed concrete floor units; modelling and analytical methods; gravity load resisting systems; foundations; and miscellaneous elements (shells, folded plates, stairs and architectural cladding panels). Design equations are reported where necessary, but the emphasis is on principles. Ordinary cast-in-place reinforced concrete is not considered in this report. This fib state-of-the-art report is intended to assist designers and constructors to provide safe and economical applications of structural precast concrete and at the same time to allow innovation in design and construction to continue. This Bulletin N° 27 was approved as an fib state-of-art report in autumn 2002 byfib Commission 7, Seismic design.

This volume contains the proceedings of the Fourth International Conference on Sustainability in Energy and Buildings, SEB12, held in Stockholm, Sweden, and is organized by KTH Royal Institute of Technology, Stockholm, Sweden in partnership with KES International. The International Conference on Sustainability in Energy and Buildings focuses on a broad range of topics relating to sustainability in buildings but also encompassing energy sustainability more widely. Following the success of earlier events in the series, the 2012 conference includes the themes Sustainability, Energy, and Buildings and Information and Communication Technology, ICT. The SEB’12 proceedings include invited participation and paper submissions across a broad range of renewable energy and sustainability-related topics relevant to the main theme of Sustainability in Energy and Buildings. Applicable areas include technology for renewable energy and sustainability in the built environment, optimization and modeling techniques, information and communication technology usage, behavior and practice, including applications.

* Presents the basics of seismic-resistant design of concrete structures. * Provides a major focus on the seismic design of precast bracing systems.

An examination of creative systems in structural and construction engineering taken from conference proceedings. Topics covered range from construction methods, safety and quality to seismic response of structural elements and soils and pavement analysis.