Civil Engineering Reference
In-Depth Information
The authors do not recommend this simple method for structural braced frames
or frames with shear walls. The analysis of two such frames, presented in Chapter
7, indicated that the lateral earth pressure behind them can exceed the
recommended ASCE-7 loading.
10.2.2 Analysis of RFERS Subject to Temperature Variations
As shown throughout this manuscript, the response of RFERS subject to large
temperature variation is an important condition that requires investigation for the
proper design and detailing of this class of structures.
The magnitude of the lateral earth pressure developed during the expansion
cycles (rise in temperature) was found to vary greatly depending on the RFERS
geometry, overall aspect ratio, and structural stiffness. Earth pressure magnitudes
reaching those equivalent to the passive earth pressure, even higher, were found to
develop (theoretically) behind a number of frames.
Given the non-linear aspects of the cyclical behavior, and number of
parameters affecting the overall response of the soil-structure system, it is a
difficult task to determine simple procedures for the analysis of these structures, or
even analytical methods for the estimation of some of the parameters that are
important in the design of RFERS.
More research is therefore recommended in an effort to develop simplified
methods and procedure to aid in the analysis and design of RFERS subjected to
large temperature variations.
In the interim, the large number of parametric analyses presented in Chapters 8
and 9 as well as Appendices A and B, can serve as a preliminary guidance to
estimate the magnitude of earth pressure loads developed during expansion cycles,
and the corresponding deformations and stresses in the RFERS structural
members.
As a general rule, longer and stiffer frames tend to develop larger stresses in the
structural members as well as larger earth pressure, compared to the shorter and
more flexible counterparts.
